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in Optics by (48.5k points)
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A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image 10 cm from the lens?

1 Answer

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Best answer

v = -10 cm; f =-15 cm; u = ?

Lens formula:

\(\frac{1}{u} = \frac{1}{v} - \frac{1}{f}\)

Type of lens: Concave lens

u =-30 cm 

Thus, the object distance is 30 cm.

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